Polyester-vinyl chloride copolymer adhesive

ABSTRACT

A laminating adhesive is claimed containing a copolyester of 10 to 30 parts sebacic acid, 40 to 70 parts of terephthalic acid, 20 to 40 parts of neopentyl glycol and 40 to 70 parts of ethylene glycol in admixture with 50 to 150 parts of vinyl chloride/vinyl acetate copolymer, about 5 to 40 parts of a plasticizer together with a mixed aromatic-ketone solvent.

v [72] Inventor:

United States Patent Downey I y [54] POLYESTER-VINYL CHLORIDE 1 'COPOLYMER ADHESIVE Raymond E. Downey, Akron, Ohio [73] Assignee: The Goodyear Tire & Rubber Company, Akron, Ohio 221 Filed: Nov. 10, 1969 211 Appl. No.: 875,577

[52] I U.S. Cl ..'..260/873, 1 l7/161 K, 161/232 [51] Int. Cl. ....B32b 27/08, B32b 27/10, C08g 39/10 [58] Field of Search ....260/8'73, 31.6; 117/161 K;

[56] References Cited UNITED STATES PATENTS 3,382,295 5/1968 Taylor et al. .;...260/860 a [451 Oct. 17, 1972 3,501,554 3/1970 Aylesworthetal....,..260/3l.6

3,520,844 7/1970 Pontius, ..260/873 3,374,137 3/1968 Wiener ..161/232 FOREIGN PATENTS OR APPLICATIONS 599,523 3/1948 GreatBritain ..260/873 1,105,620 3/1968 Primary Examiner william'H. Short Assistant Examiner-'Edward Woodberry Attorney-F. W. Brunner and Hubert A. Pattison, Jr.

[57] ABSTRACT 2 Claims, No Drawings Great Britain ...260/873 This invention relates to laminating protective films to wood and other substrates. More particularly the invention comprises a laminating adhesive for polyvinyl chloride and wood comprising a copolyester of sebacic acid, terephthalic acid, neopentyl glycol and ethylene glycol in admixture with 50 to 150 parts of vinyl chloride/vinyl acetate copolymer (i.e. PVC/PVAC copolymer), 5 to 40 parts of a plasticizer such as dioctyl phthalate together with a mixed aromatic-ketone solvent.

In order to more fully describe the present invention,

The range of vinyl chloride to vinyl acetate which may be used in the copolymer is 85 to 95 perce'nt of former to 5 to percent of the'latter.

The copolyester usedin the above example contained units from ethylene glycol and units from neopentyl glycol in the ratio of 56/44 and units from terephthalic acid and sebacic acid in the ratio of 71/29.

The example illustrates the invention with respect to the use of a specific copolyester of sebacic acid,

terephthalic acid, ethylene glycol and neopentyl glycol. Such resins of a range of compositions can beused. For example the ethylene glycol units can range from 40 to 60 percent of the total glycol units; the neopentyl glycol units can range from 60 to 40 percent'of the total; the terephthalic acid units can range from to 75 percent of the total acid units and the sebacic acid units can range from 80 to percent of the total acid units.

' Other copolyester resins can be used in place of the ethylene glycol-neopentyl glycol-terephthalate sebacate copolyester used inthe example. Representative examples of such copolyesters are ethyleneneopentyl terephthalate isophthalate copolyesters in which the ratio of ethylene glycol units to neopentyl glycol units is in the range of 40/60 to 60/40 and the terephthalic acid units and isophthalic acid units in the copolyester are present in the-range of 95/5 to 50/50 tetramethylene-terephthalate isophthalate sebacate copolyesters in which the units of the acids are present in the range of 20 to 50 of terephthalic units to 5 to 50 of isophthalic units and 50 to 20 percent of sebacic units.

Instead of all or part of the di-octyl phthalate such plasticizers may be used as butyl benzyl phthalate, dibutyl phthalate, di-octyl adipate, di-decyl adipate, and the like.

The ratio of ketone to aromatic solvent mixture may be 'ketone (e.g. acetone) 40 to 100 percent, aromatic solvent 20 to 60 percent. The types of ketones within the purview of the invention include, among others,

acetone, methyl ethyl ketone, methyl isobutyl ketone and the like. Typical ar omatic solvents which may optionally but preferably be used include toluene, xylene, benzene and mixtures thereof.

METHOD OF APPLICATION The adhesive is mixed with l or 3 to 15 or 20 parts per parts of adhesive of a polyisocyanate, preferably a polyaryl polyisocyanate such as polymethylene polyphenylisocyanate as a curing agent and applied to a board or other surface using a coating machine. The coated board is then dried in an oven at 50 to 150 C. for 3 to- 10 or 20 minutes. The dried coating is reactivated with heat (e.g. to C.) and a vinyl chloridefilm or other film is applied to the hot adhesive under a pressure ofabout 20 to 60 psi. The laminate is then cooled and the finished product comprises a panel coated with a decorative and protective polymeric film.

Typical polyisocyanates suitable for the purposes of the present invention include, among others, 1,5- naphthalene 'diisocyanate, 4,4'-diphenyl diisocyan'ate, 4,4'-diphenylene methane diisocyanate, 'p-phenylene diisocyanate, 2,4-tolylene diisocyanate, 4,4',4"- triphenyl methane triisocyanate, 4,4'-tolidine diisocyanate, dianisidine diisocyanate, hexamethylene diisocyanate, 4,4'-diisocyanate of diphenyl ether, and mixtures thereof.

Typical vinyl chloride-vinyl acetate resins for solution coatings are shown inthe following table:

TABLE I Approximate chemical Approx. Composition by wt. specific vinyl vinyl gravity chloride acetate Solution Properties approx. viscosity k by solvent at 25C. weight ratio CPS.

Toluene 5.9% by weight of hydroxyl calculated as vinyl alcohol added.

Resort may be had to modifications and variations of the disclosed embodiments withoutdeparting from the spirit of the invention or the scope of the appended claims.

What is claimed is:

1. An adhesive composition consisting of a mixture of a copolyester in which the acid units consist of 80.to

25 percent of sebacic acid units and 20 to 75 percent of terephthalic acid units and the glycol units consist of 60 to 40 percent of neopentyl glycol units and 40 to 60 Y percent of ethylene glycol units with '50 to (15) 150 2. Adhesive composition in accordance with claim 1 parts per lOO part of the copolyester of a vinyl in which the copolymcr of vinyl chloride and vinyl chloride-vinyl acetate copolymer which is 85 to 95 peracetate is N in amOl-mt f 80 to 125 parts per cent by weight of vinyl chloride and 15 to 5 pei'cent by 100 Parts Ofthe p y weight ofvinyl acetate. 5 a: ar 

2. Adhesive composition in accordance with claim 1 in which the copolymer of vinyl chloride and vinyl acetate is present in the amount of 80 to 125 parts per 100 parts of the copolyester. 